Bend radius

About: Bend radius is a research topic. Over the lifetime, 3303 publications have been published within this topic receiving 35415 citations. The topic is also known as: minimum bend radius.

Bend-resistant large-mode-area photonic crystal fiber with a triangular-core

Abstract: In view of its feasibility for fabrication and application, a bend-resistant large-mode-area photonic crystal fiber with a triangular core is proposed. In our design, the fiber proposes a solution to the issue of bend distortion. The mode field area of the fundamental mode at the wavelength of 1.064 μm achieves 930 μm2 at the straight state and 815 μm2 at a bending radius of 30 cm, respectively. The decrement of the mode field area at the bend state is only 12.473% compared to the straight state. Furthermore, when the fiber is bent with a bending radius of 30 cm, numerical results demonstrate that the fiber conforms to single-mode operation conditions and the bending orientation angle can be extended to ±55°. A large mode area at bent state and low sensitivity of bending orientation make the fiber of great potential in high-power fiber lasers.

All carbon nanotube based flexible field emission devices prepared through a film transfer method

Abstract: Utilizing carbon nanotubes (CNTs) as substitutes for the conventional rigid indium–tin oxide (ITO) electrodes, all CNT based flexible field emission devices (FEDs) were possible to prepare with a novel film transfer method. In the method, both CNT-based flexible cathode and anode were fabricated by first attaching the vacuum filtered CNT film/mixed cellulose eater (MCE) filter membrane to an adhesive semi-cured poly(dimethyl siloxane) substrate, and then peeling off the MCE filter membrane. Effects of bending direction and bending radius on field emission properties were studied. The field emission performance of the convex bending device was worse than that of the flat device and deteriorated further with the decrease of bending radius. In contrast, the concave bending device exhibited better field emission properties than the flat device; nevertheless, its field emission properties decreased as the concave bending radius reduced below a certain value. The method achieved two successes. One is that the interfacial interaction between CNT films and the flexible substrate was greatly enhanced. The other is that the transfer process improved the field emission properties due to the increase of vertically aligned CNT tips. Compared with traditional methods applied in FED preparation, the novel modified transfer method is organic free, easy to control, cheap, and environment friendly.

Fiber optic cable retainer assembly and clip with a bend-radius control surface

Abstract: A cable retainer assembly is adapted for segregating, bundling, and routing fiber optic cable inside a cable management cabinet. The retainer assembly includes a mounting track for being located inside the cabinet, and having first and second opposing end edges, and first and second opposing side edges. An arcuate retainer clip is carried on the mounting track between its opposing end edges and side edges. The retainer clip defines a bend-radius control surface adapted for controlling the degree of bend experienced by fiber optic cable held by the retainer clip. The retainer clip has a base, and at least one outwardly-extending cable retainer arm formed with the base. The cable retainer arm is spaced-apart from the bend-radius control surface to retain a bundled plurality of fiber optic cable inside the cabinet.

A machine for continuously bending an elongated workpiece at predetermined radii

Abstract: A machine for continuously bending an elongated workpiece at predetermined radii, machine that uses a series of driving rollers ( 1, 2, 3 ) for bending, includes a 2D laser displacement sensor ( 5 ) downstream the series of driving rollers ( 1, 2, 3 ) for bending and a computer ( 7 ) that is coupled among other to the 2D laser displacement sensor ( 5 ) for calculating a radius of a bend section and comparing the calculated radius of curvature with the desired radius of curvature. The computer ( 7 ) is coupled to a length meter ( 4 ) for measuring a length of the bend section concentrically to the elongated workpiece (T) and, further, to operating elements ( 8 ) adapted to operate a roller ( 2 ) of the series of driving rollers ( 1, 2, 3 ) for bending in order to adjust it on the base of a difference between the measured radius of curvature and the desired radius of curvature.

Low bending loss and effectively single-mode all-solid photonic bandgap fiber with an effective area of 650 μm 2

Abstract: A large-mode-area all-solid photonic bandgap fiber with a seven-cell core and five high-index rod rings is investigated. Numerical simulations show that an effective area of more than 500 μm2, a bending loss of less than 0.1 dB/m at a bending radius of 10 cm and effectively single-mode operation can be achieved simultaneously. A core diameter of 44.8 μm and an effective area of 650 μm2 at 1064 nm are achieved in a fabricated fiber. Bending loss at 1064 nm is 0.09 dB/m at a bending radius of 7 cm. Effectively single-mode operation is also realized at a bending radius of 10 cm.